Thermosyphon Solar Water Heater relies on the natural circulation of water between the collector and the tank or heat exchanger. In this type of installation, the tank must be located above the collector. As water in the collector is heated it becomes lighter and naturally rises into the tank. Meanwhile, cooler water in the tank flows down to the bottom of the Collector, causing circulation throughout the system. These systems move household water or a heat-transfer fluid through the system without pumps. This kind of passive systems have the advantage that electricity outage and electric pump breakdown are not issues.

Thermosyphon Solar Water Heater relies on the natural circulation of water between the collector and the tank or heat exchanger. In this type of installation, the tank must be located above the collector. As water in the collector is heated it becomes lighter and naturally rises into the tank. Meanwhile, cooler water in the tank flows down to the bottom of the Collector, causing circulation throughout the system. These systems move household water or a heat-transfer fluid through the system without pumps. This kind of passive systems have the advantage that electricity outage and electric pump breakdown are not issues.